package day1104.demo03;

import java.util.*;
import java.util.stream.Collectors;
import java.util.stream.Stream;

/**
 * @program: qy158
 * @description:
 * @author: 闫克起2
 * @create: 2022-11-04 10:55
 **/
public class Test03 {
    public static void main(String[] args) {
        List<Person> personList = new ArrayList<>();
        personList.add(new Person("Tom",24,"美国",'M'));
        personList.add(new Person("欧阳雪",18,"中国",'F'));
        personList.add(new Person("Harley",22,"英国",'F'));
        personList.add(new Person("小梅",20,"中国",'F'));
        personList.add(new Person("向天笑",20,"中国",'M'));
        personList.add(new Person("李康",22,"中国",'M'));
        personList.add(new Person("何雪",21,"中国",'F'));

        Map<Character, List<Person>> collect = personList.stream().collect(Collectors.groupingBy(item -> item.getSex()));
        System.out.println(collect);

//        Set<String> set = personList.stream().filter(item -> item.getAge() > 20)
//                .filter(item -> item.getCountry().equals("中国"))
//                .map(item -> item.getName())
//                .collect(Collectors.toSet());
//        System.out.println(set);
//        Map<String, Person> map = personList.stream().filter(item -> item.getAge() > 20)
//                .filter(item -> item.getCountry().equals("中国"))
//                .collect(Collectors.toMap(item -> item.getName(), item -> item));
//        System.out.println(map);

//        Long collect =personList.stream().collect(Collectors.counting());
//        System.out.println(collect);
//        Double collect = personList.stream().collect(Collectors.averagingInt(item -> item.getAge()));
//        System.out.println(collect);
//        Optional<Person> collect = personList.stream().collect(Collectors.maxBy(((o1, o2) -> o1.getAge() - o2.getAge())));
//        System.out.println(collect);
//
//        Integer collect = personList.stream().collect(Collectors.summingInt(item -> item.getAge()));
//        System.out.println(collect);


        //聚合操作---count
//        long count = personList.stream().count();
//        System.out.println("个数:"+count);
        //聚合操作---max min
//        Optional<Person> max = personList.stream().max((o1, o2) -> o1.getAge() - o2.getAge());
//        System.out.println(max.get());

        //匹配操作--所有元素都必须匹配条件 才返回true
//        boolean b = personList.stream().allMatch(item -> item.getAge() > 10);
//        System.out.println(b);
//        boolean b = personList.stream().anyMatch(item -> item.getAge() > 50);
//        System.out.println(b);


        //find操作-- findFirst 获取流中第一个元素
//        Optional<Person> first = personList.stream().findFirst();
//        System.out.println(first.get());
        //find操作---findAny() 获取流中任意一个元素  必须使用并行流测试
//        Optional<Person> any = personList.parallelStream().findAny();
//        System.out.println(any.get());

        //sort排序操作--年龄
//        personList.stream().sorted((o1,o2)->Integer.compare(o1.getAge(),o2.getAge())).forEach(System.out::println);

        //map映射操作--名称
        //personList.stream().map(item->item.getName()).forEach(System.out::println);

        //筛选出年龄大于20--------filter
//        personList.stream().filter(item -> item.getAge() > 20).forEach(item-> System.out.println(item));
        //personList.stream().filter(item -> item.getAge() > 20).forEach(System.out::println);


    }
}
class Person {
    private String name;
    private Integer age;
    private String country;
    private char sex;

    @Override
    public String toString() {
        return "Person{" +
                "name='" + name + '\'' +
                ", age=" + age +
                ", country='" + country + '\'' +
                ", sex=" + sex +
                '}';
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public Integer getAge() {
        return age;
    }

    public void setAge(Integer age) {
        this.age = age;
    }

    public String getCountry() {
        return country;
    }

    public void setCountry(String country) {
        this.country = country;
    }

    public char getSex() {
        return sex;
    }

    public void setSex(char sex) {
        this.sex = sex;
    }

    public Person(String name, Integer age, String country, char sex) {
        this.name = name;
        this.age = age;
        this.country = country;
        this.sex = sex;
    }
}
